对右下图二叉树进行后序遍历的结果为（）
ABCDEF
B. DBEAFC
C. ABDECF
DEBFCA
The reason why so many children like to eat this new brand of biscuit is that it is
A. fragile
B. feeble
C. brisk
D. crisp
Although we tried to concentrate on the lecture，we were （） by the noise form. the
A. distracted
B. displaced
C. dispersed
D. discarded
What does Glaser say about the regrowth of rainforests？
A. They take centuries to regrow after being burnt．
B. They cannot recover unless the vegetation is burnt completely．
C. Their regrowth will be hampered by human habitation．
D. They can recover easily after slash-and-burn farming．
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